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Hurni, Hans (1988). Options for conservation of steep lands in subsistence agricultural systems. In: Moldenhauer, W.C.; Hudson, W. (eds.) Conservation Farming on Steep Lands (pp. 33-44). Ankeny, USA: Soil and Water Conservation Society
Hurni, Hans (1985). An ecosystem approach to soil conservation. In: El-Swaify, Samir Aly; Moldenhauer, W.C. (eds.) Soil erosion and conservation (pp. 759-771). Ankeny, USA: Soil Conservation Society of America
